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Residual error of radii in millimeters. Shape differences between sockets and electronic American Academy of Orthotists and Prosthetists (AAOP) files for socket C. Regions where socket is larger than electronic AAOP files are blue; regions where socket is smaller than electronic AAOP file are red. (a)–(b) Company 9 showed up to 3 mm error over crest of tibia. (c)–(d) Company 2 showed <1 mm error over tibial crest.
